How to implement rounding up to nearest integer in Java?

In Java, you can use the ceil method of the Math class to round up to the nearest whole number. This method takes a double type parameter and returns a double type result.

Here is an example code:

double num = 3.6;
double roundedNum = Math.ceil(num);
System.out.println(roundedNum); // 输出4.0

In the code above, set the value of the variable num to 3.6, then use Math.ceil(num) to round it up to the nearest whole number and assign it to the variable roundedNum, finally output the value of roundedNum as 4.0.

Please note that the Math.ceil method can only round up double data types. If you need to round up other data types, you can convert them to double type before using the Math.ceil method.